77940007 has 4 divisors (see below), whose sum is σ = 77984856. Its totient is φ = 77895160.

The previous prime is 77939989. The next prime is 77940011. The reversal of 77940007 is 70004977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77940007 - 2⁷ = 77939879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77940097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19708 + ... + 23329.

It is an arithmetic number, because the mean of its divisors is an integer number (19496214).

Almost surely, 2^77940007 is an apocalyptic number.

77940007 is a deficient number, since it is larger than the sum of its proper divisors (44849).

77940007 is a wasteful number, since it uses less digits than its factorization.

77940007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44848.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 77940007 is about 8828.3637781868. The cubic root of 77940007 is about 427.1562975039.

The spelling of 77940007 in words is "seventy-seven million, nine hundred forty thousand, seven".